Books: Framework Design Guidelines

Do not believe your eyes - this book is pitch black in reality (no, it can't be a different book, can it?).
Have you ever chosen between property and method or wondered if you should call your class WtfThngMgc? Here is your guide with sound DO's and DONT's. The .NET Framework guys cover pretty much everything you need when designing your own framework. You can learn from all their breakthroughs, mistakes and trade-offs which they carefully analyze. As all good books it sounds like you've always known all this stuff but forgot.
Great job highlighting distinctive features of application and framework code - worth reading.